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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '035e151ce21180a5d5b1a94f72d5f659f29cb5a58a2080a3b4e0adaea29177d4' 
  AND token = 'hghEo0CKuAmjgUOtoTBHLXOCaPEttSZdKYeGOailsMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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