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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee6fe832e73bfae22689baf99f73a1db8c4ba19ad156dd29a84ea869f15fd9da' 
  AND token = 'e8sit/F7ylDhtdJb+chyYxhU5AJwOLyMbkoZagllneU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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