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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de947c3b9b002fc2ab933bc98ec65a07748c0fdf53af254eb32e4438dc864d79' 
  AND token = 'D9+rjk8QbWBgvN6+nk7sebfkw8lrEVXsZdhAT7hnAxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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