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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '564548c2ad7672ac37054abeab5359064d9fef442fd8f6901b6ed0bfae943fe1' 
  AND token = 'hKA+sRRErlpP5V1ptMU7Wq8Wz4L4IRmLV2f3QtIjEWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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