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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76ada5d7c6bcb3bd089ab7db407b9172196349df167d61cb8e11c6138ad8ce46' 
  AND token = 'Z/u0aN6ctImOmHhxlwM7qrUoId1gKz1W7/bSBoC/8n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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