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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46dbb9d27041b848557f4a3f04b97fd0d7ac013aff6b395526fd922e01b49987' 
  AND token = '5uDkRlRnxzf5Nwxq+McQ14U6JuSxkDVMNb5Svow4Lbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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