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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e053513f9973485f2bfb633a8162f7bece24fa6f387d94e77f9de7cf8f9b6b8c' 
  AND token = 'cebSDT5wntHUNw5WZ8hWktvy5irrqBp4taiATDENquo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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