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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ff5e20118e57e6489a8eca76a79bd47d5303b448d8e733a21b2d04955ce46aa' 
  AND token = '/RlOqL30HO72QRyxNm0xDLwhCddNEJI7EvIjxvraGw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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