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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ffd189acc4c37df4fab804b8aa41f4189d686c59bcf80a226bc46cee728b8d1' 
  AND token = 'gURnx26Nd373HVXSjB0Jko5DusbbCZNkXgJwnOSAYdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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