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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04f023dd49d6ce7ca70dd084fbafc510dc849e1a988480f9cf6f3ae4d8eb9ee4' 
  AND token = 'nWiYEDwOR7+BcWI1t2TZQCQeTBntEXd1+fcHzwAwqMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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