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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a3a14d3107e26f48bfde0e1a476f0aae91f167b36fbb606172fafef3ed17c8c' 
  AND token = 'emWEIhe3dTfQdqcdcDLScmHRSzK5QVkeXiJd5kOhXLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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