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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e43fb093fc7b77f0382751a020beb20b46e3bcdfe6a413ad9abdac054bef851a' 
  AND token = '2Bo/ahg3Xwz4mo55gsjuryCm4GLWzp64o6A7QhLOve0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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