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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fe0d45b741ff726a3a2a0a75c82d60dfa3bdf3cbd3e3e73f2baf45be9fc9547' 
  AND token = 'E3qqhchH3+MZdhgy2zhm8OLBrJt34nsnyxoAHyF2wLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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