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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '103590eab66209c7b6180b784bc38687e414b61a087c3b6487c50479880f3d88' 
  AND token = 'bl66h1VmYvAo38P37IQYNCekKQTBQKcoFe/4avYFkK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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