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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ec4bf55eefd785291083190b3bb0687d4be7170f7d3cb64e62f9076f8ac5f2a' 
  AND token = '9UUB5Xf4Wh5RGC6xaay60QpDfrZcJwIW2NHFtSEEkzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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