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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e30e2963be280811a2aa4a19e89bcf1b3326a6f18179a34882e33de517ec37e' 
  AND token = 'DUMrO5QO7FN1pN2QkfRQWFzGWGeitiIVrrwfypy0ABQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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