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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d78ade5532f135eeadea1aef55a00ff04a15d65ac5b4ad2c910bb709dc93160' 
  AND token = 'dB2c0+R9I6+vRZbDagvucACjg2OrqoSgaGtQimSQGFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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