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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1676d8fc5a2cf59188eb3cde2bacd8b6da39598b22d41859462d62f872e6ab6' 
  AND token = 'SfHvwEZmaYcvVvcUSPaWyWJ+k8vegk3eJNaQGW40UHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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