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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca69c5cbfbf687a422a410f74a9aa10b9a4ab22a6e5d8d9fc4ba41a4e5289d14' 
  AND token = 'BecoKmFcjdQbCFmeb5fDZa7DqrqZj/t9wZj+BPaEjmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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