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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2836e0ec847de110406bf8d619812d7bfc58a1f3b3ed079b1634300cb2848b62' 
  AND token = 'vGBcgkfbcOR/ehMm8MmsHsomdMHmj5jIO9fzX9LZTtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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