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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31c0f20884a97083bdd0c00e6eb0d667eab348046653b7f795aea87e61849e83' 
  AND token = 'Lvzzj5M1s6oZvLaeCsso0fCAh84Ikp/Y9/Bc6rRX6jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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