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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e5241ed47af8f3dd2a9d36efae04a51c05d06a316feaa44f835b769192b91ca' 
  AND token = 'yO7Ny/X+5oDJP5w7W1FnhVp9kcOqQ0XXsQgnqP5boYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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