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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8abf5b676d5d15c0bd40a7a2866202b3c5af2ca89019e811e0b8403e53b8d0c6' 
  AND token = 'qsk79tAP31iNYWE136i3Wp2H73JFjfkBrb9ElppP5yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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