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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e49a884551a183510d6228b9ab5dcb568d1e01a06ef6ce67ed0bf438f5d5c04a' 
  AND token = 'K/tgKvzpp8RR6T5P6fDVGp2yv+I0ieWLoKV1EWOImu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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