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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebb8a31aae05ab1cca8ee1bbf560d1394fac6222ebfec1ea565a7e043a6c6d44' 
  AND token = 'Lh7oES61YjqYdRR4yuqViRAzPjU/9gRV8NHMynhPB2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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