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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '834a08f9653b06dd035fd0f16e317b935b604d7599b90d97fabdc7b913f3caf3' 
  AND token = 'fnvK93TN1Cb0MmqbOCdCNlVsVm3XPYw+I7CASaz41No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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