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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cdfc20430d3731f0d2e98220114275066b5cdd1cf81caf5d1d309b73e7b6a2f' 
  AND token = '6CKCz46YkXc6y5vNU6sUQz5RzIfb5ady7OMQhJCdzPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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