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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03d1598327edd71bebf878018a735383347f5164266c775deb530e0b899efdb2' 
  AND token = 'u+ZOtuL/hNsuR1TMdbEAttuYQ3Mjrm3LzoPX9/S6ITo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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