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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31fe2fed0965a18f0aa2e606f2acd4ef72875647d5064bb8a55cf37d84f394e3' 
  AND token = 'a8e2EaxWzHGZNbQ6qUqwifC5Sm22doasPWjcLWw8KsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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