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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8f1bcb8384225471496545e413283de6f27d85a9b3b3a556eab9a1daa4caa95' 
  AND token = 'yPAw8ZG+p4JNb6UKsVuUtl5BVeYGlPi1m5fNNtlC08M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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