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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fe8eaade37d07f63a7aab728c94ee0f98a2fe8377668fcfcbe06d53d3e3a81a' 
  AND token = '+BHf+0f5c8MOBh7p9qaDnCFg0Lnb9hV6u2ZEJMeNdBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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