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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd0cd7523d944540fd75f745ad51adf19d95adb537b7d9c6fcc97da6b8ccbc55' 
  AND token = 'cFL2Ews9ip0ReqI3+Yk6dhf+Jz1Uj02plb+/VbvToqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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