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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea21384315ecb5a86f2e7128d442da5b618b3e9be4489b6c86815d6fbbb6b9ba' 
  AND token = 'nKpFt+vzjCjY6MiRFm+DR4poraA+Ij/7TI6d9aUibec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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