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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdc957736fe4fab4d20916dab534110baad657089a546b597de32df90013864f' 
  AND token = 'G3RxsqL0snriK9nFo05LE992rqqL4AUw6GWj7lToEoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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