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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5ea064acf058545bc4e0f44e9e6825c1cca2b96b7d5ef94a0cfaadd7c77f3a1' 
  AND token = 'kvBQphtayNG2rAsx6fbWC9wWBblCF6f6f++gCWK3dIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}