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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b53e8249b5f3b6d410f9eed67f377e2d16e1804260007dfe83bf55ca8c154e7b' 
  AND token = 'Tvey9stDMsksJnN7Yj86qFSAYcdy99YRO7Y7mlrktm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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