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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acc31d542beb14f22311d24f9eeb4921e201fb867c6dac6d4b8c4e2800c06c60' 
  AND token = 'Rle+4pTYJMWUkxvlx3c8vNkPgL7vUlxbum2J3iBMchU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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