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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddb37d3eade4ed755b4e2dfc16928d441ecf1115ac15d7d5ac1a3d16e6f5b03a' 
  AND token = '5bLp2UNsRGnRMm+Z49J1STqMbl6pG1SyMZszGvhU+oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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