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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94d4eca744558aaf5eee02ac4a82a6a4f12b1d6c390801b1b6ae90246f59c8e4' 
  AND token = '5bKTVw31IddjdrmDGLNfs34ehgnL4zsfJil1MltRzZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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