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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96a7af51bf8db00858b3f177ee68e7327443048f42cbe85f008c2a78de1daaf0' 
  AND token = 'pydL55zDpCdUya7UTaONPJOy4+ddbX6X14rZPyjXuyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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