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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa50ba3f4aae8b6516fd766b46ccc2d179e57957d367b0ce031a2758fa22506c' 
  AND token = 'mMVmhkBQsw9j1NiH8wby4OdXY+RM0ejCE55luQqyy98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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