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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5b467e477e58a8723fbf8aa88c236ffbcc86c3b9f93ba9a09fb230eacc99a5a' 
  AND token = 'cgmRsrVUpWe4SD9fdfI7MXW7vEn8/8kWeTA4Nsve1E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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