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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ad09007fa40e61d537c9182acefd1da1f8f86616023ca95c569b5194e7acc64' 
  AND token = 'gw4GNShVsQHb/dnPQ66jNgDHOpnWU6s9GcLujuPiWX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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