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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cac703e8d6f5880d1f97ba1806e22f6b53c2add300a7d04b67903b348f4630cd' 
  AND token = 'GA3kEac8+m5HReI3OtqIFz17d+gFyfeJ8AsCk3AJggw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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