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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e93608a6564acd1ec5cf6392a5c514004c9cb6b150393bfcc62f322175b5e45' 
  AND token = '6lgzRHmR98emmHh4lblpBOeorX3SHiqkvBrbVfGRGQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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