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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e566b8f17e270b2632276dbdf140c8aeedceb28e4bf5cc68171bd4f40e489c8' 
  AND token = 'WRvJDc+4D3cqBbaXKQLRa0Fit3ocUVeOrYS/N8NY0YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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