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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fa4da4f13eff8c09ea03b50d8e2e571cfcac4d80ab9386ad970c534472c79c8' 
  AND token = 'fbWoAcjAxGql332KzSsGQSnW6Y2oeuvKYo7fKGlxkBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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