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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a86f88944d06b35b1bfbeb35c6ddaa1237fb9859fd462b04d9cfae44dddebf27' 
  AND token = 'DJrrEU8fmn4J+Qdm6q/9eqCWRHTDquMGU4oZFoanN8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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