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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcb42ef1ba24e8ccff329f758edc5753ef33e821d21c8449e29617584b02b327' 
  AND token = 'pnLPa12Ss+4ayNpf/2p1+7qRcqFhRC+G1S7IR7WbGik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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