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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ed95a6df89cb530aa6701213f04692850a80c15d99dc38cda5cc58efa712b5b' 
  AND token = 'sWafDS92c5sRayI2c0sK3w6rcBPoBeMrZEXZrElbz50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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