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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dbb3dbcae8ab2c4441351f7c295368bd940889c7feff264a2cc9f02c0b772a2' 
  AND token = '+MhioZNmWv3WHdB0riaaraPuYfh1P2oLKGUj2y3XtiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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