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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '682cad7fc29410b3e28ec718c9d0372716dc607b807613dd0a4778a3824204bd' 
  AND token = 'KpNiIqlga5z8fll+1zYdxdCg0v3K4IRSg7DY/xq1jw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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