SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3802df3237118b67d5175f2c9a80c5b133b472d333d4eef98c8858a714e2942' 
  AND token = '/vLAst9ggMhu0QxnzEYTHWQ3Hj84IsTwp7AbKmQgEoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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