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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c1cec5fb36b5d17e401b6463636a44488f490e9e55ec858799eee2a59ee0872' 
  AND token = '6ZTaYKjsFp51/o7k6etbywB9SGNkszRGfR3yLC61BGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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